{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["process parameter", "concept or principle", "engineering feature", "application", "machine or equipment", "material"], "input": "The first approach is by mixing metal particles with the material joining mechanism ."}
{"process parameter": [], "concept or principle": ["mixing"], "engineering feature": ["material joining"], "application": [], "machine or equipment": [], "material": ["metal"]}